With almost universal availability of Internet and the availability of reliable on-line productivity tools, such as Google Docs, individuals as well as companies are switching over to Cloud Computing. In this blog I will post items of interest to my colleagues/patrons/clients.

i have a spreadsheet that has three columns for each month we will call them x1,y1,z1 next month i insert three new columns after z1 and we will call them x2,y2,z2 and so forth.

there are a few columns at the very end and one of them i'm trying to get total for last 12 months of x. i can do this with a formula i change each month but i'd really like some way to say take the column 3 to the left + 6 to the left + 9 to the left... till i get a total of 12 then when i insert to columns it automatically changes to the last 12...